Rack stand



FIG. 1 is a forward perspective view of a rack stand showing my new design;

FIG. 2 is a frontal view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is an opposite side view thereof;

FIG. 6 is a plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a rack stand, as shown and described. 